Muffler attachment for safety-valves



(N'o Model.)

G. W. RICHARDSON.

} MUFFLER ATTACHMENT FOR SAFETY VALVES. No. 342,267. Patented May 18, 1886.

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GEORGE TV. RICHARDSON, OF MEDFORD, MASSACHUSETTS.

MUFFLER ATTACHMENT FOR SAFETY-VALVES.

SEJECIFIGATION forming part of Letters Patent No. 342,267, dated May 3,8, 1886.

Application filed December 3, 1895. Serial No. 184,592.

To @ZZ whom, t may concern.:

Be it known that I, GEORGE W. BrennansoN, a citizen of the United States, residing` at Medford, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Muffler Attachments to Safety-'Valves ol" which the following is a specification.

The object of this invention is to suppress the noise of escaping steam blowing from pipes, nozzles, valves, or other openings.

In the present instance the invention is adapted for use in connection with a special kind of safety valve known to the trade and to users of steam appliances as a popvalve.77 This valve has practically superseded all known forms of safety-valves by reason of its greater efficiency in discharging surplus steam more rapidly and in closing promptly without material loss oi' the working pressure. This result is due to the greater and more rapid lift of the valve, and consequent increased size of its steanrescape open` ing, combined with a prompt and early clos ing action. The sudden or popA17 action of the valve produces an explosive noise, and therefore l have adapted my invention to this particular kind of valve, in order that its merits will be .fully appreciated.

rlhe invention is embodied in a valve of the kind referred to, invented and patented by me, which is controlled by a direct-acting spring arranged above the valve and within an inclosing-casc, the stcanrescape opening being outside of and beneath said case and the muliier attachment applied above said escapeopening` and surrounding the spring-casing.

The invention consists in a series oi' superposed cups having a central opening fitting snugly around the spring-inclosing easing and vertical sides or circumferential flanges, upon which the successive cups rest, said ilanges ibrming a continuous side wall and inclosed chambers, into which the steam is blown through perforations made in thc bottom of each cup, a perforated plate or cover being placed at the top ofthe serios of: cups, which secures the whole in place.

My improvements can best be explained and understood by reference to the'accompanying drawings, in which- Figure l is a vertical central section of a (No model.)

valve and casing embodying my improve ments. Fig. 2 is a plan view of a section of the muffler attachment; and Fig. 3, a modiiication o'f the means for adjusting thelift of the valve, all of which will bc hereinafter fully described.

a represents the steamway; b, the valve, and c the valve-spindle extending therefrom to the top of the casing and supporting the spring mi, the tension ol' thelatter being regulated by an adjusting and jam nut, in the usual way.

d represents a screw-ring for adjusting the size of the escape-opening from the small chamber under the extended valve-head by moving the same up or down, all of which is well understood in connection with this class of valves.

The spring-inclosing shell or case is represented at fi and the valve-inclosing shell at z.

The valve b is provided with an annular ring or flange, lr, projecting vertically therefrom and telescoping with the springinclos-r ing case i, to shut ont the escaping steam from the spring-chamber, and also steady the movcnient ofthe valve.

,lhese elements already enumerated make up the principal feature oli' the valve shown and now in general use, and l will now pro ceed to refer to myimprovements. The mufllier attachment is made up of a series of superposed cups, o, that surround the spring' inclosing case fi and rest upon the top of the valvecase 7i. The cups are piled as shown, held in contact by the cap-plate and nntp, and in vertical line by the spring-inclosing case. The adjoining circumferential flanges of each cup are closely fitted and form a continuous side wall to the inclosed chambers s, which have perforated bottoms, as shown, and through which the escaping steam is directed successively to the atmosphere in a divided state, that breaks up and suppresses the sonorous sound ofthe steam, this effect being well known and variously carried out.

In order to limit the litt of the valve I), an adjustable screw-ring, h, Fig. 3, may be applied to the springinclosing case adjacent to the valve, which can be given a range of movement equal to the extreme lift of the valve, and then moved up or down to vary the space between it and the valve when the IOO latter is seated, and thereby regulate and limit the lift of the valve and its capacity for discharge, so that no more .steam can pass into the muffler'than can escape freely Without huddling; or, as shown in Fig. 1, the screwyring h, Fig. 3, is dispensed with, the lower end of the spring-inclosing case forming the stop to limit the lift of the valve, the adjusting feature being in this instance transferred to the valve-casing h, as shown. This latter arrangement is preferred, as the adjustment is more easily effected, and, besides, all lost motion of the connected parts is constantly taken up in consequence of the spring-tension acting at all times in conjunction with the valve-casing 7L.

The adjustable case h or ringh may be held in place by means of a set-screw, as shown in Fig. l, and the ring h may be operated from without by cutting an aperture in the case.

GEORGE W. RICHARDSON.

Vitnesses:

GHAs. W. FoREEs, AUGUsTUs CREVELING. 

